Germany - treatment or remediation of contaminated soil

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Details

Provided by Open Opps
Opportunity closing date
10 August 2020
Opportunity publication date
14 July 2020
Category
90732300: Po
Value of contract
to be confirmed
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Description

In accordance with the 6th supplement to the special operating plan "Groundwater remediation", the LMBV has been carrying out source remediation on the site of the former Lauchhammer coking plant using the pump&treat process since 2011. This measure is to be replaced by a final remediation and securing of the source. Partial soil remediation and securing of the source at the tank farm site by enclosing the damage in two spatially separated remediation areas are planned. The measures "capsule tank farm" and "soil remediation tank farm" are to be implemented in accordance with the officially approved remediation framework plan for the Lauchhammer coking plant and prepared by comprehensive engineering planning. The aim of the measures is to permanently reduce pollutant emissions into the groundwater and the environment. The planner is responsible for developing and implementing an economical safety solution that can be implemented and approved according to the state of the art.
HOAI work phases 1 to 2 plus special services; for options see point II.2.11The aim of the soil remediation is to remove the primary sources in GWL100/400 as far as possible and to limit the pollutant emission in GWL500 to such an extent that biological self-purification processes (NA processes) become increasingly effective in the effluent in GWL500. At the current state of planning and investigation, a soil exchange with the following scope is planned: Remediation area: 4 300 m2 (approx. 55 m x 78 m); remediation depth: 2.5 m...5 m uGOK.The contamination of the soil and the contamination distribution are to be determined by detailed investigations. On the basis of intervention and reinstallation values for the soil, which have been agreed by the authorities and must continue to be coordinated in accordance with the principles of proportionality, the final excavation cubature and suitable disposal routes or treatment methods must be selected. The exploration services are to be planned, accompanied and evaluated in a professional technical manner. A logistics concept with material flow management is to be drawn up for soil removal, soil cleaning/disposal and soil installation. Existing media lines must be secured and laid as required. During the construction work, measures must be taken to prevent the carry-over of contaminated soil. The technical design and function of the safety elements of the "capsule tank farm" are available to the AG at the planning level "feasibility study". According to this study, the structure of a technical protection system with the following elements is to be planned and developed: Enclosure of the source in the distribution area of the coal layer with a vertical sealing wall over a length of approx. 390 m (current planning status) and integration of the sealing wall into the coal dam layer at approx. 15 m uGOK, service life: >200 years; system permeability of the overall structure: at least 100 times less than the initial value. Sealing of the secured area with a surface sealing (trafficability with vehicles with a total mass of up to 25t; impermeability: gas- and liquid-tight) with rainwater collection/drainage Ventilation of the aeration zone must be provided to enable pressure equalisation inside the capsule. The exhaust air from the capsule shall be treated via an exhaust air filter which shall be operated as a respiratory filter due to periodic groundwater level fluctuations. For the dimensioning of the respiratory filter, forecasts of the gas composition of the soil air in the aeration zone shall be made. To protect the respiratory filter against overload/poisoning, technical ventilation of the unsaturated part of the capsule during active biostimulation phases shall be provided. Elements for the introduction and distribution of reactive substances in the GWL500 and for venting of the unsaturated zone are to be implemented by the planner according to the specifications of the AG. Control and monitoring elements (GWM, injection elements) are to be provided within the capsule. The GWM monitoring in the environment and in the outflow of the capsule, as well as the optional securing of the capsule base (so-called success securing measures) are not part of the planning services. For this purpose, the AG will decommission the groundwater treatment plant "MPPE-Anlage Tanklager" located at the site. The plant will be completely dismantled by the Principal (containers, tanks, conveyor/infiltration wells, etc.). The plant for redox-controlled in situ biooxidation (r-BOZ plant), which is also located at the site, is to continue to be operated for approx. 5 years after the MPPE plant is decommissioned. The r-BOZ plant is to be protected during the construction phase or to be relocated as required.

Opportunity closing date
10 August 2020
Value of contract
to be confirmed

About the buyer

Address
Lausitzer- und Mitteldeutsche Bergbauverwaltungsgesellschaft mbH Knappenstraße 1, Einkauf Lausitz Senftenberg 01968 Germany
Contact
falk.michel@lmbv.de

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